0xe000810c - Physical Volume Library Drive not available.
Tape devices not detected under Robotic Library.
If the issue is still not resolved, review the following article -
How to troubleshoot issues with a Robotic Library (autoloader/changer) and/or Tape Drive(s).
Communication issues between a Tape library or Tape drive(s) and the Backup Exec server.
Tape drive or Robotic Library serialization issue.
Perform a sequential Power Cycle to resolve any communications issues between a Tape library or Tape drive(s) and the Backup Exec server.
Tape storage devices are not visible in Backup Exec console. Other issues may include Tape drives or Tape libraries that are offline, storage devices that are not found, recognized, or detected. Tape drives that do no appear under Robotic Library but appear as standalone devices.